Multiple Cylinder Engine Vibration Management
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Solution Overview
Problem
Internal combustion engines with single cylinders, commonly used in outdoor power equipment, face limitations in performance and efficiency, necessitating improvements in function, operation, and energy delivery, particularly in scenarios where electric motors are impractical.
Innovation Solution
A multiple cylinder internal combustion engine design featuring a first piston in a first cylinder with a combustion chamber, a second piston in a second cylinder, and a crankshaft coupled with both pistons for rotational motion, utilizing check valves and return springs to manage fuel-air mixture intake and expulsion, and potentially including a pressure accumulator for enhanced starting and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single cylinder engine is used, then the device complexity is reduced and manufacturing cost is lowered, but the power output and efficiency are limited
Solution Approach 1:
The engine is divided into multiple cylinders (first cylinder, second cylinder, third cylinder) each with its own piston, allowing the system to generate more power through combined combustion events while maintaining modular architecture that manages complexity
Solution Approach 2:
The engine utilizes staggered combustion cycles across multiple cylinders with different piston positions (first piston at top dead center, second piston at bottom dead center, third piston at intermediate position) to create periodic power delivery that smooths output and increases overall power generation
2Stability of the object's composition
If a single cylinder engine is used, then the structure is simpler, but vibration management and operational smoothness deteriorate
Solution Approach 1:
The engine uses the second piston at bottom dead center as a counterweight to balance the reciprocating mass of the first piston at top dead center, reducing vibrations and improving operational stability without requiring additional external counterweights
Solution Approach 2:
The engine divides the power generation function across multiple pistons and cylinders, with each piston contributing to different phases of the combustion cycle, thereby distributing mechanical stresses and reducing overall vibration
3Productivity
If check valves and return springs are added to manage fuel-air mixture, then the efficiency and power output improve, but the device complexity increases
Solution Approach 1:
The check valves and return springs are configured to automatically control the fuel-air mixture flow and piston movement without external control mechanisms, allowing the engine to self-regulate the intake and expulsion processes, thereby improving efficiency while adding minimal complexity
Solution Approach 2:
The check valves act as intermediaries between the cylinders and the fuel-air mixture supply system, automatically controlling flow direction and timing to optimize combustion efficiency without requiring complex electronic control systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multiple cylinder design enhances power output, efficiency, and vibration management, providing improved performance and operational characteristics compared to single cylinder engines, while allowing for effective use in scenarios without access to electrical power.
Implementation Method 1
The inlet associated with the second cylinder may include a check valve arrangement between the intake system and the second cylinder
Implementation Method 2
A return spring may be associated with the second piston, and may be configured to maintain contact between a cam follower associated with the second piston and the cam
Implementation Method 3
A crankshaft may be coupled with the first piston and the second piston for rotational motion associated with reciprocating movement of the first piston and the second piston
Implementation Method 4
a combustion chamber fluidly coupled with the first cylinder. An ignition source may be at least partially disposed within the combustion chamber
Data Source
AI summary
An internal combustion engine may include a first piston reciprocatingly disposed in a first cylinder, a combustion chamber fluidly coupled with the first cylinder, and an ignition source at least partially disposed within the combustion chamber. An intake valve may provide selective fluid communication between an intake system and the combustion chamber, and an exhaust valve may provide selective fluid communication between an exhaust system and the combustion chamber. A second piston may be reciprocatingly disposed within a second cylinder. An inlet associated with the second cylinder may be fluidly coupled with the intake system, and an outlet may be fluidly coupled with one or more of the first cylinder and the combustion chamber. A crankshaft may be coupled with the first piston and the second piston for rotational motion associated with reciprocating movement of the first piston and the second piston.